I've shot a lot of PB in handloaded 1oz target loads. It is far and away the worst powder for shooting in the cold. At 10deg F your barrels look like you've been shooting black powder and you have to check your barrels between EVERY shot and put a factory target load through each bbl when your done just to clean the bores out. I've shot it down to maybe -20F, where it is pretty comical in performance and not worth the squib/stuck wad chance. I will no longer shoot it below -10F under any circumstances. In warmer weather I really like it for use in very light 12ga guns and 24gr loads, which go out at 1150fps and only 4200psi. That load is really nice in my light damascus 1-frame GHE12. It's also a great grouse/woodcock load in hvy cover with that gun.
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